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aqua 4(3)_Age and growth of shrimp

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Volume 4, Issue 3 – April 2001

Eugenio Alberto Aragón-Noriega and Luis Eduardo Calderon-Aguilera: Age and growth of shrimp (Decapoda: Penaeidae) postlarvae in the Upper Gulf of California, pp. 99-104

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SINGLE PAPER

Volume 4, Issue 3 – April 2001

Eugenio Alberto Aragón-Noriega and Luis Eduardo Calderon-Aguilera: Age and growth of shrimp (Decapoda: Penaeidae) postlarvae in the Upper Gulf of California, pp. 99-104

Abstract
Postlarvae are a critical stage in the life cycle of the shrimp because catches depend on the strength of this year class. To assess the growth of postlarvae in the upper Gulf of California, intensive sampling was performed during a complete tide cycle from July 12-27, 1995 and from June 30 to July 16, 1996, simultaneously in two locations: one off the mainland (Santa Clara) and one off the peninsula (San Felipe). A 10-minute trawl was performed every hour during the flood tide (day and night). The total length of each individual postlarva was determined by measuring it with the aid of a calibrated micrometer (0.001 mm). Two species were found: Farfantepenaeus californiensis and Litopenaeus stylirostris, known as brown and blue shrimp, respectively. Subsequently these two species were reared to assess their age from their length. Wild postlarvae range from 7 to 13 mm and average 9 mm. It was concluded that wild postlarvae are recruited to the upper Gulf of California 20 to 28 days after being spawned in oceanic waters.

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